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Nuclear factor-kappa B contributes to excitotoxin-induced apoptosis in rat striatum.

Abstract：

:Excitotoxin-induced destruction of striatal neurons, proposed as a model of Huntington's disease, involves a process having the biochemical stigmata of apoptosis. Recent studies suggested that transcription factor nuclear factor (NF)-kappa B may be involved in excitotoxicity. To further analyze the contribution of NF kappa B to excitotoxic neuronal death in vivo, changes in binding activities of NF kappa B and other transcription factors as well as the consequences of inhibiting NF kappa B nuclear translocation were measured after the infusion of quinolinic acid (120 nmol) into rat striatum. Internucleosomal DNA fragmentation and terminal transferase-mediated dUTP digoxigenin nick end labeling-positive nuclei appeared 12 hr later and intensified over the next 12 hr. NF kappa B binding activity increased several-fold from 2 to 12 hr, then gradually declined during the next 12 hr. Other transcription factor changes included AP-1, whose binding peaked about 6 hr after quinolinic acid administration, and E2F-1, which was only modestly and transiently elevated. In contrast, quinolinic acid lead to a reduction in OCT-1, beginning after 12 hr, and briefly in SP-1 binding. The NF kappa B, AP-1, and OCT-1 changes were attenuated both by the N-methyl-D-aspartate receptor antagonist MK-801 and the protein synthesis inhibitor cycloheximide. Moreover, quinolinic acid-induced internucleosomal DNA fragmentation and striatal cell death were significantly reduced by the intrastriatal administration of NF kappa B SN50, a cell-permeable recombinant peptide that blocks NF kappa B nuclear translocation. These results illustrate the complex temporal pattern of transcription factor change attending the apoptotic destruction produced in rat striatum by quinolinic acid. They further suggest that NF kappa B activation contributes to the excitotoxin-induced death of striatal neurons.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Qin ZH,Wang Y,Nakai M,Chase TN

doi

10.1124/mol.53.1.33

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

33-42

issue

1

eissn

0026-895X

issn

1521-0111

journal_volume

53

pub_type

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